Polyethylene-coated carton wraps to reduce the deterioration in internal quality of eggs

1973 ◽  
Vol 13 (62) ◽  
pp. 257
Author(s):  
RJ Hughes
Keyword(s):  
Storage Temperature ◽  
Low Density Polyethylene ◽  
Internal Quality ◽  
Low Density ◽  
Ambient Temperatures

Deterioration in the internal quality of unwashed eggs was reduced when eggs packed in cartons enclosed in paper wraps coated with 0.013 mm of low density polyethylene were compared with eggs packed in unenclosed cartons. During storage at 12.8�C, the reduction in deterioration was slight, but statistically significant, after four days and somewhat greater after eight days. A storage temperature of 23.9�C, simulating ambient temperatures during summer months (December-February) differences after both four and eight days.

scholarly journals Pengaruh Ketebalan Plastik Polietilen Densitas Rendah Sebagai Bahan Pengemas terhadap Mutu Daun Seledri (Apium gravelens L.) Selama Penyimpanan Dingin

2019 ◽  
Vol 8 (2) ◽  
pp. 240
Author(s):  
I Kadek Puja Harta Hadi ◽  
Ida Ayu Rina Pratiwi Pudja ◽  
Gede Arda
Keyword(s):  
Weight Loss ◽  
Storage Temperature ◽  
Packaging Material ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
The Right ◽  
And Storage

Salah satu cara yang dilakukan untuk mempertahankan kualitas daun seledri dan memperpanjang umur simpan adalah menggunakan pengemasan dengan ukuran ketebalan plastik polietilen densitas rendah (LDPE) yang tepat dan penyimpanan pada suhu rendah. Tujuan penelitian ini adalah untuk mengetahui pengaruh ketebalan plastik polietilen densitas rendah sebagai bahan pengemas terhadap mutu daun seledri selama penyimpanan dingin dan untuk mengetahui tingkat ketebalan plastik polietilen densitas rendah berapakah yang dapat mempertahankan mutu daun seledri yang terbaik. Metode penelitian ini menggunakan penelitian eksperimental. Rancangan  percobaan  yang  digunakan  adalah  Rancangan  Acak  Lengkap  (RAL) dengan perlakuan ketebalan plastik polietilen densitas rendah dengan ukuran ketebalan 0,02 mm; 0,03 mm; 0,04 mm; 0,05 mm, 0,06 mm. Pengamatan dilakukan setiap 3 hari sekali dan setiap perlakuan diulang sebanyak 3 kali pada suhu penyimpanan 100 ± 20C selama 18 hari penelitian. Parameter dalam penelitian ini adalah susut bobot, kadar air, warna, tekstur, tingkat kesegaran, dan aroma. Hasil analisis ragam menunjukkan bahwa perlakuan ketebalan plastik LDPE sebagai bahan pengemas daun seledri berpengaruh sangat nyata (P?0,01) terhadap parameter penelitian. Perlakuan terbaik diperoleh dari ketebalan plastik polietilen densitas rendah ukuran 0,04 mm dengan susut bobot 4,64 %, warna 18,97, tekstur 0,0455 N, kadar air 90,22 %, tingkat kesegaran 4,87 dan aroma 5,00. Kesimpulan bahwa tingkat ketebalan plastik LDPE 0,04 dapat mempertahankan mutu daun seledri paling lama diantara ukuran ketebalan yang lainnya yaitu selama 18 hari.     One way to maintain the quality of celery and extend shelf life is to use packaging with the right size level of low density polyethylene (LDPE) and storage at low temperatures. The purpose of this study was to determine the effect of low density polyethylene plastic as a packaging material on the quality of celery during cold storage and to determine what size level of low density polyethylene plastic can maintain the best quality celery. This research method uses experimental research. The study applied a completely Randomized Design (RAL) with one treatment factor: size level of LDPE plastic (0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm). Observations were carried out once every 3 days and each treatment was repeated 3 times at a storage temperature of 100 ± 20C for 18 days of the study. The parameters in this study are weight loss, water content, color, texture, level of freshness, and aroma. The results of the analysis of variance showed that the treatment of size level of LDPE plastic as a celery packaging material had a very significant effect (P?0.01) on the research parameters. The best treatment was obtained from the size level of a low density polyethylene plastic size of 0.04 mm with a weight loss is 4.64%, a color is 18.97, a texture is 0.0455 N, a moisture content is 90.22%, a level of freshness is 4.87 and a scent is 5.00. The conclusion that size level of LDPE plastic is 0.04 mm can maintain the longest quality of celery among other size level for 18 days.

scholarly journals Photo-selective shade nets on the production and quality of sugarcane plantlets

2019 ◽  
Vol 23 (5) ◽  
pp. 366-371 ◽  
Author(s):  
José J. F. Cordeiro Júnior ◽  
Héliton Pandorfi ◽  
José A. D. Barbosa Filho ◽  
Alex S. Moraes ◽  
Luiz A. de Almeida Neto ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Substrate Temperature ◽  
Principal Component ◽  
Global Solar Radiation ◽  
Saccharum Officinarum ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Randomized Design ◽  
Completely Randomized Design

ABSTRACT Brazil is the world’s largest producer of sugarcane (Saccharum officinarum L.) and research aimed at propagation has promoted higher quality in production. The objective of this study was to investigate the effect of the variation of micrometeorological elements on the survival and quality of pre-sprouted sugarcane plantlets. The study was carried out in a protected environment (UFRPE). Plantlets of the cultivar RB92579 were obtained by the technique of production of pre-sprouted plantlets. The protected environments were divided into four modules covered with low-density polyethylene plastic + photo-selective shade nets and one module without shade net. Micrometeorological data of global and photosynthetically active solar radiation, air temperature, substrate temperature, relative humidity and the solar radiation spectrum were recorded in each module. The experiment was conducted in a completely randomized design and the principal component analysis was used to verify the association between the cultivation modules, micrometeorological variables and crop variables. Anti-UV low-density polyethylene plastic + freshnet led to lower transmittance of global solar radiation, higher percentage of photosynthetically active radiation and lower plantlet mortality. Substrate temperature above 30.2 °C resulted in higher plantlet mortality. Larger spectrum in the red range led to the production of better quality plantlet. The use of freshnet shade net promoted adequate conditions for the cultivation of sugarcane plantlets and allows obtaining better quality plantlets.

scholarly journals Vida útil de polpa congelada de araticum embalada ou não a vácuo

2019 ◽  
Vol 6 (1) ◽  
pp. 114-121
Author(s):  
Cristiane Maria Ascari Morgado ◽  
Ana Paula Silva Siqueira ◽  
Eli Regina Barboza de Souza ◽  
Annelisa Arruda de Brito ◽  
Luis Carlos Cunha Junior ◽  
...  
Keyword(s):  
Titratable Acidity ◽  
Soluble Solids ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Antioxidant Power ◽  
Total Antioxidant ◽  
Ferric Reducing Antioxidant Power ◽  
Annona Crassiflora

The objective of this work was to evaluate the role of two types of conditioning process in quality of frozen and stored araticum’s pulp at -18ºC. The fruits were collected at pre-maturing developmental stage, packed into boxes wrapped with bubble plastic, transported to the laboratory and stored for 7 days at 22ºC and 90% RH to complete the maturation. Afterwards, they were pulped and the pulp was stored in: 1) low-density polyethylene packages (LDPE) 60 micro, hermetically packed in a sealing machine or 2) low-density polyethylene packages (LDPE) 60 micro vacuum sealed. Those units were frozen at -18ºC for 402 days and were evaluated at processing day and at 30; 90; 150; 210 and 402 days of storage, for soluble solids contents (SS), titratable acidity (TA), SS/TA, ascorbic acid, total extractable polyphenols and total antioxidant activity using the Ferric Reducing Antioxidant Power (FRAP) method. The results were submitted to an analysis of variance and the means were each other compared using Tukey test with Sisvar software. It is conclued that is not necessary the use of vacuum to package the frozen araticum’s pulp for 402 days, at -18ºC. Keywords: Annona crassiflora Mart, freezing, vacuum.  

scholarly journals Baseline Data of Low-Density Polyethylene Continuous Pyrolysis for Liquid Fuel Manufacture

Recycling ◽  
2022 ◽  
Vol 7 (1) ◽  
pp. 2
Author(s):  
Aleksandr Ketov ◽  
Vladimir Korotaev ◽  
Natalia Sliusar ◽  
Vladivir Bosnic ◽  
Marina Krasnovskikh ◽  
...  
Keyword(s):  
Liquid Fuel ◽  
Pyrolytic Carbon ◽  
Poor Quality ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Polymer Waste ◽  
Bio Oil ◽  
Heating Oil ◽  
Small Parts

The recycling of end-of-life plastics is a problem, since small parts can be returned into circulation. The rest is burned, landfilled or recycled into low-quality heating oil by pyrolysis methods. The disadvantages of this method are the need to dispose the formed by-product, pyrolytic carbon, the poor quality of produced liquid fuel and the low productivity of the method associated with the periodicity of the process. In this work, methods of thermogravimetry and chromatography–mass spectrometry (GC-MS) have been used to study the co-pyrolysis products of low-density polyethylene (LDPE) and oxygen-containing substances at the pressures of 4–8 MPa and temperatures of 520–620 °C. Experiments have highlighted the conditions needed for producing of high-quality liquid fuel. Initial data have been prepared for the design of a continuous pyrolysis reactor to dispose polymer waste for the production of bio-oil which would be available to enter the petrochemical products market.

Quality of Canned Celery Produced from Sliced Celery Stored Under Modified Atmospheres

1980 ◽  
Vol 43 (12) ◽  
pp. 924-928
Author(s):  
C. E. JOHNSON ◽  
R. C. LINDSAY ◽  
J. B. WESSON
Keyword(s):  
Low Density Polyethylene ◽  
Modified Atmosphere ◽  
Low Density ◽  
Sensory Panel ◽  
Green Color ◽  
Modified Atmospheres ◽  
Co2 Levels ◽  
Polyethylene Bags ◽  
Pale Green

Canned celery that was acceptable to a laboratory sensory panel was produced from fresh, sliced celery which had been held up to 3 weeks at 4 C under modified atmospheres in closed polyethylene bags. Sliced celery held in air at 4 C became unacceptable within 1 week. Celery packaged in 0.7-mil high density/4.4-mil low density coextruded polyethylene developed the highest CO2 levels (25%) of samples prepared, and became progressively dark olive-green colored. Similar darkening was not observed for celery in 3-mil low density polyethylene packages. Modified-atmosphere packaged celery became more firm than fresh celery during storage. Sliced celery dipped in sodium bisulfite solutions was a lighter, pale-green color than untreated celery. Celery tissue and microbial respiratory action rapidly modified atmospheres in closed bags to give ca. 2% O2 and 12% CO2 in 2 days, and ca. 1.5% O2 and 17–25% CO2 after 16 days.

The Effect of Thyme Oil Low-Density Polyethylene Impregnated Pellets in Polylactic Acid Sachets on Storage Quality of Ready-to-Eat Avocado

2017 ◽  
Vol 11 (1) ◽  
pp. 141-151 ◽  
Author(s):  
Malick Bill ◽  
Sreejarani Kesavan Pillai ◽  
Peter Tinyane ◽  
Suprakas Sinha Ray ◽  
Dharini Sivakumar
Keyword(s):  
Polylactic Acid ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Storage Quality ◽  
Thyme Oil

scholarly journals Application of Room Cooling and Thermal Insulation Materials to Maintain Quality of Okra during Storage and Transportation

Horticulturae ◽  
2021 ◽  
Vol 7 (7) ◽  
pp. 188
Author(s):  
Jutarat Rattanakaran ◽  
Rattapon Saengrayap ◽  
Chureerat Prahsarn ◽  
Hiroaki Kitazawa ◽  
Saowapa Chaiwong
Keyword(s):  
Mass Loss ◽  
Thermal Insulation ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Cool Temperature ◽  
Linear Low Density Polyethylene ◽  
Insulation Materials ◽  
Pulp Temperature

A combination of room cooling and the use of thermal insulation materials to maintain okra quality under simulated storage and transportation was evaluated. Okra pods were packed in plastic baskets and either cooled at 18 °C or not cooled in a room for 2 h. After either room cooling or no cooling, the okra pods were covered with three different materials: (1) perforated linear low-density polyethylene (P-LLDPE), (2) two layers of heat-reflective sheet with thin nonwoven (HRS+TNNW), and (3) metalized foam sheet (MFS). Typical handling (TP) without cooling and covering with P-LLDPE was used as the control. The six treatments were conducted during simulated storage (18 °C for 48 h) and transportation (30 °C for 15 h). Results showed that MFS gave the best insulation properties (Qx and R-values), followed by HRS and TNNW. After room cooling, both HRS+TNNW and MFS materials delayed the time for pulp temperature to reach 18 °C (10 h), compared to P-LLDPE (2 h). TP presented the highest mass loss (17.8%) throughout simulated conditions, followed by cooling plus P-LLDPE (15.2%) and either of the thermal insulation materials with or without room cooling (3.6% to 5.2%), respectively. TP, cooling plus P-LLDPE, and no cooling plus MFS (44% to 56%) showed the highest percentage of decay, while cooling combined with both HRS+TNNW and MFS gave the lowest decay incidence (11–21%). Findings demonstrated that room cooling combined with HRS+TNNW had the highest efficiency for preserving cool temperature and reducing decay, compared to TP and room cooling plus MFS.

scholarly journals PENGARUH LIMBAH PLASTIK LOW DENSITY POLYETHYLENE TERHADAP KARAKTERISTIK DASAR ASPAL

2019 ◽  
Vol 19 (1) ◽  
pp. 59-66
Author(s):  
Birahmatika Afriyanto ◽  
Eva Wahyu Indriyati ◽  
Probo Hardini
Keyword(s):  
Specific Gravity ◽  
Softening Point ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Modified Asphalt ◽  
Fire Point ◽  
Directorate General ◽  
Basic Characteristics ◽  
Plastic Content

Abstract One way to reduce damage of the pavement structure is to improve the quality of asphalt used. In an effort to improve the quality of the asphalt, additives are added, such as polymers. This study aims to determine the basic characteristics of Low Density Polyethylene Plastic modified asphalt, which includes penetration, softening point, flash and fire point, specific gravity, ductility, viscosity. In addition, it will be determined the maximum content of Low Density Polyethylene Plastic which produces modified asphalt that meets the standards of the Directorate General of Highways. The results of this study show that modified asphalt with Low Density Polyethylene Plastic can increase the asphalt softening point and reduce penetration value, flash and fire point, specific gravity, ductility, and viscosity of asphalt. The maximum LDPE Plastic content that can produce modified asphalt that meets specifications of the Directorate General of Highways is 5%. Keywords: plastic, asphalt quality, additives, basic characteristics of asphalt, modified asphalt  Abstrak Salah satu cara untuk mengurangi kerusakan struktur perkerasan jalan adalah dengan meningkatkan mutu aspal yang digunakan. Dalam upaya peningkatan mutu aspal dilakukan penambahan bahan aditif, seperti polimer. Penelitian ini bertujuan untuk mengetahui karakteristik dasar aspal modifikasi plastik Low Density Polyethylene, yang meliputi penetrasi, titik lembek, titik nyala dan titik bakar, berat jenis, daktilitas, viskositas. Selain itu, akan ditentukan kadar maksimal plastik Low Density Polyethylene maksimal yang menghasilkan aspal modifikasi yang memenuhi standar Bina Marga. Hasil pengujian menunjukkan bahwa aspal modifikasi dengan plastik Low Density Polyethylene dapat meningkatkan titik lembek aspal serta menurunkan nilai penetrasi, titik nyala dan titik bakar, berat jenis, daktilitas, dan viskositas aspal. Kadar plastik LDPE maksimal yang dapat menghasilkan aspal modifikasi yang memenuhi persyaratan Bina Marga adalah 5%. Kata-kata kunci: plastik, mutu aspal, bahan aditif, karakteristik dasar aspal, aspal modifikasi

scholarly journals Physicochemical and enzimatic transformations of "eva" apples stored under modified atmosphere

2014 ◽  
Vol 38 (4) ◽  
pp. 375-381
Author(s):  
Ariela Betsy Thomas ◽  
Caroline Roberta Freitas Pires ◽  
Luiz Carlos de Oliveira Lima
Keyword(s):  
Titratable Acidity ◽  
Soluble Solids ◽  
Low Density Polyethylene ◽  
Postharvest Quality ◽  
Experimental Unit ◽  
Modified Atmosphere ◽  
Low Density ◽  
Randomized Design ◽  
The City

The need for a permanent market supply of fresh fruit has generated great interest in postharvest techniques that can promote useful life and quality of the fruit. The aim of this study was to evaluate the efficiency of atmospheric modification using different polymeric films in maintaining postharvest quality and prolonging the shelf life of Eva (Mallus sp) apples. For this, fruits from the city of Barbacena - MG, selected and sanitized were packed in plastic trays and wrapped in the corresponding films. The films used were: polypropylene - 20 µm, low-density polyethylene - 14 µm and high-density polyethylene - 7 µm. Another group of fruits (control) was not submitted to a modified atmosphere. Subsequently, all the the packages were stored under refrigeration (0 ° C ± 0.5) for 210 days and the evaluations of the following variables were performed every 30 days of storage: hydrogen potential (pH), titratable acidity, soluble solids, weight loss, firmness, total pectin, soluble pectin, pectin methyl esterase and polygalacturonase. The work was conducted in a completely randomized design (4x8), with 4 treatments and 8 experimental times. Each treatment consisted of three replicates and each experimental unit consisted of six fruits. The results were submitted to variance analysis and means were compared by the Tukey test at 5% probability and regression analysis. The low density polyethylene (14 µm) packaging provided the best conservation of the Eva cultivar apple textural characteristics.

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